PCM/FM Quadrature Demodulation based on Poly-phase Filter
Yao Yuan-cheng · Communications technology · 2011
The traditional coherent orthogonal demodulation method requires the extraction of carrier signal with the same frequency and phase,thus increasing the demodulation difficulty.According to the characteristics of PCM/FM radio signal in telemetry system,the demodulation method based on Poly-phase filter orthogonal transform technique is adopted.This method,by the multiphase filtering method,realizes orthogonal transformation and requires no recovery of the carrier signal in the receiver,thus reducing the circuit implementation complexity in the traditional demodulation.The demodulation effect of the different methods is simulated with MATLAB and compared,the error rate data given in the table,and the feasibility and superiority of the method verified.